Stay away from wood if at all possible.

Composite (like Trex & such) is the way to go. Cost is a bit more but it lasts forever, no paint needed & you won't get splinters in your hiney.

No promises but I'll see if I can take a pic or two next time I'm at our local shootin' place. The benches are simple, easy to maintain, adjustable & inexpensive.
Can't say for sure if I can go this week(end). I had my left eyeball rebuilt Monday & the medic said something about sticking a rifle somewhere where I won't be able to pull the trigger if I screw up his work in the next week or so.
I kinda feel like I have a bionic eye now. Almost like a Borg....